How to make a Minecraft hacked client?

I wanna make a Minecraft hacked client (it'll be private, for me and my best friend). I only know how to code the fly, aim-bot, and X-Ray, but I want to be able to make it how you can go into Creative without being OP. I know that "Team Avo can do it, so where can I find a client that can give me creative, or can someone link me to a page that will help, or comment below?

It really isn't that hard to install, but you can easily get banned on servers for hacking… I have not heard of a client that give you creative with out being OP. This youtube video Should help with getting a client that has a bunch of hacks (Not Getting Creative though)